Longknife, I don't know who you are quoting, but I have built two .58 fullstock Hawkens and never had any problems with recoil. This one has been shot over 500 times now, a lot of those loads were 140 grains of Goex 2F. Here I am on an elk hunt in the Uintah Mountains last November when I slipped on a rock and came down on the toe on another rock. Since repaired.
The Green River Rifle Works built their halfstock and fullstock Hawken copies in .45, .50, .54, .58, .62 and 69 calibers. I remember one muzzleloader match in the late 70's, probably, where Doc White and I were tied and backed up to about 200 yards before I lost out with my .45 Green River Leman Indian rifle. One of the GRRW employees was shooting a big halfstock GRRW Hawken, .69 caliber I think, and he had a powder load that would turn him half around when he shot it. He was just goofing off, but he enjoyed showing off, that recoil must have hurt.